KevinAndVicki -
Could you supply a picture that clearly shows the shape of the cross-section? That might give us some ideas.
I also notice that the English picture shows that it is one long piece of rubber with two ends, rather than a single piece molded in a circle. In that case, where you put the ends will be important. With the top off your toilet, put in enough water to run the pump, and flush it. Note the places where no water would impact the joint.
Bill
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